If you're looking to check out these books from your library (wherever that is) and they don't have them, there are a couple of ways you can locate books. In most cases you can request the book at your local library through the ILL (Interlibrary Loan System). Most US as well as UK libraries have such a system and the book is located and sent to your library for you to check out. In my system here there is a fee of $3 per book and you're allowed to check a book out for three weeks.
Most of us are closer to or belong to one library but usually find there are several libraries within a reasonable distance. So first I would look at WorldCat: http://www.worldcat.org/
Once at WorldCat enter the title of the book (I checked already and all the books I mentioned are listed on WorldCat). Then, click on the list title and it shows you libraries in your area that hold this book.
You also probably have a Family History Center near you. Their libraries vary tremendously between one branch and the next, but if a book is available on microfilm (they have readers in each center) you can order it and read it in their library (most are able to copy pages for you). Go to: http://www.familysearch.org/eng/library/fhc/frameset_fhc.asp
and enter your location information to find one or more near you.
Still another way to obtain one or more of these books is to find and buy used copies. Bookfinder.com can locate these books from thousands of booksellers and often they're fairly cheap (depending on demand and condition). They list both new and used copies. I just ran "Frederick Lewis Weis" as the author and "Ancestral Roots" as the title and got numerous hits. The best price I found on a used copy was $10.74 (US). Elizabeth Hallam's "Chronicles of the Age of Chivalry, is also a bargain. Best price I found is $3.95 (the seller says minimal damage to cover and binding). Unfortunately, two of the books I mentioned are rarer and/or have higher demand running the price up. Moriarty's "Plantagenet Ancestry," and Faris' Plantagenet Ancestry of Seventeenth-Century Colonists" are both pricey (over $100 when I checked). So all told there are several ways in which to get access to these books. I hope this helps. Jay